I haven't used those lanes since Xmas day, but it seems my MD EZpass transponder was read correctly. However, I do dispute the times at which I am told I passed under the gantries.
Additionally, I am even more convinced that the pricing (for both these HO/T lanes and those along the Beltway) is set to go up when based on the traffic volume in the GP lanes, not the toll lanes. Frequently when I have used the Beltway ones in the middle of the day, there is virtually no traffic (certainly the 1-2 other cars I encounter do not affect my travel speed) but the pricing varies.
On the 12/7/22 trip I took (partially documented above), I used the I-66 GP lanes eastbound, then wanted to use the NB Beltway HO/T lanes because I knew the Beltway was reduced to 3 lanes NB at the Dulles Toll Road for bridge reconstruction. To use the Beltway HO/T lanes (either direction) from I-66 EB requires one to use a stretch of I-66 HO/T lanes first (ramp is after Chain Bridge Rd). I had no traffic slowdowns whatsoever, but for this privilege I was charged $4.20 for the 1 mile stretch on I-66, then $8.95 to cruise for a few miles on the Beltway. (Looking at the photos I took which seems to be approaching the Nutley Street Metro station in the HO/T lanes, the sign tells me I would actually be charged $7.25 to use the Beltway; there may have been another sign further along that I didn't document.) (Don't try to look this up on Google Maps; they have yet to find any of these stretches of heavily-traveled road worthy of being updated 3 months after the HO/T lanes fully opened.) (I am told I traveled on the NB Beltway 9 minutes before I traveled on EB I-66.)